Synthesis and properties of FeCl4-doped polythiophene

Jan-Erik Österholm, Pentti Passiniemi, Heikki Isotalo, Henrik Stubb

Research output: Contribution to journalArticleScientific

75 Citations (Scopus)


Electrochemically synthesized polythiophene films containing BF4−-anions, PT-BF4, have been carefully reduced and re-oxidized with FeCl4-anions to obtain highly conducting PT-FeCl4-films. The maximum conductivity we have observed for this complex is 50 Scm−1 which corresponds to a maximum dopant concentration of approximately 26 mol-%.

Thermoelectric power (TEP) measurements of lightly and heavily doped PT-FeCl4 show that the positive TEP decreases drastically from 614 μV/K to 10.5 μV/K when the conductivity increases from 1.1 10−5 to 10.1 Scm−1. In heavily doped samples TEP is slightly overlinear, a phenomenon which is explained by a model based on conducting strands separated by thin potential barriers.

PT-FeCl4-films exhibit promising stability properties, the conductivity remaining in the metallic regime for at least 16 months under ambient conditions.
Original languageEnglish
Pages (from-to)213-218
JournalSynthetic Metals
Issue number1-3
Publication statusPublished - 1987
MoE publication typeB1 Article in a scientific magazine
EventInternational Conference of Science and Technology of Synthetic Metals, ICSM '86 - Kyoto, Japan
Duration: 1 Jun 19866 Jun 1986


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